Network Notes

[Steve O'Hara-Smith]

On Tue, 19 Feb 2013 03:46:49 -0500
Brett Wynkoop <wynkoop at wynn.com> wrote:

> Greeting-
> 
> Just discovered a difference in network performance between the Pi and
> the Bone.
> 
> wynkoop at beaglebone:~ % ping prd7
> PING prd7.wynn.com (199.89.147.7): 56 data bytes
> 64 bytes from 199.89.147.7: icmp_seq=0 ttl=64 time=2.170 ms
> 64 bytes from 199.89.147.7: icmp_seq=1 ttl=64 time=1.131 ms
> 64 bytes from 199.89.147.7: icmp_seq=2 ttl=64 time=0.977 ms
> 64 bytes from 199.89.147.7: icmp_seq=3 ttl=64 time=1.052 ms
> 64 bytes from 199.89.147.7: icmp_seq=4 ttl=64 time=1.217 ms
> ^C
> --- prd7.wynn.com ping statistics ---
> 5 packets transmitted, 5 packets received, 0.0% packet loss
> round-trip min/avg/max/stddev = 0.977/1.309/2.170/0.438 ms
> wynkoop at beaglebone:~ % 
> root at fbsd-pi:~ # ping prd7
> PING prd7.wynn.com (199.89.147.7): 56 data bytes
> 64 bytes from 199.89.147.7: icmp_seq=0 ttl=64 time=8.560 ms
> 64 bytes from 199.89.147.7: icmp_seq=1 ttl=64 time=10.222 ms

	This is an artefact of the FreeBSD drivers for the pi - Linux on
the pi gets sub millisecond ping times on my network while FreeBSD gets
the same 10ms you've been seeing. I've been assuming that it has to do with
not using DMA yet.

-- 
Steve O'Hara-Smith <steve at sohara.org>